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Loans (Detail) - USD ($) $ in Thousands	Jun. 30, 2026	Mar. 31, 2026	Dec. 31, 2025	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024
Loans and Leases Receivable Disclosure [Line Items]
Total	$ 7,311,090		$ 7,111,087
Total principal balance of loans owed, net of charge-offs	7,339,336		7,141,911
Unamortized net deferred loan fees	(15,693)		(15,896)
Discounts to principal balance of loans owed, net of charge-offs	(12,553)		(14,928)
Allowance for credit losses on loans	(130,187)	$ (127,939)	(125,762)	$ (124,455)	$ (128,423)	$ (125,366)
Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Total	5,013,880		4,853,762
Allowance for credit losses on loans	(79,660)	(79,910)	(75,532)	(74,484)	(72,180)	(72,849)
Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total	1,288,973		1,314,610
Allowance for credit losses on loans	(24,969)	(23,786)	(26,283)	(25,318)	(25,540)	(27,463)
Commercial and industrial
Loans and Leases Receivable Disclosure [Line Items]
Total	559,886		464,428
Allowance for credit losses on loans	(13,487)	(12,435)	(11,430)	(10,024)	(17,561)	(14,397)
Construction
Loans and Leases Receivable Disclosure [Line Items]
Total	298,388		301,045
Allowance for credit losses on loans	(8,451)	(8,239)	(8,231)	(10,995)	(10,346)	(7,224)
Agriculture production
Loans and Leases Receivable Disclosure [Line Items]
Total	146,190		172,494
Allowance for credit losses on loans	(3,602)	(3,548)	(4,265)	(3,609)	(2,768)	(3,403)
Leases
Loans and Leases Receivable Disclosure [Line Items]
Total	3,773		4,748
Allowance for credit losses on loans	(18)	(21)	(21)	(25)	(28)	(30)
CRE non-owner occupied \| Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Total	2,575,598		2,495,849
Allowance for credit losses on loans	(42,183)	(41,647)	(40,300)	(40,921)	(39,670)	(37,229)
CRE owner occupied \| Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Total	1,041,498		1,020,770
Allowance for credit losses on loans	(16,048)	(16,286)	(12,712)	(11,578)	(12,169)	(15,747)
Multifamily \| Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Total	1,156,848		1,085,698
Allowance for credit losses on loans	(16,688)	(16,384)	(17,327)	(15,097)	(15,604)	(15,913)
Farmland \| Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Total	239,936		251,445
Allowance for credit losses on loans	(4,741)	(5,593)	(5,193)	(6,888)	(4,737)	(3,960)
SFR 1-4 1st DT liens \| Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total	826,812		842,169
Allowance for credit losses on loans	(10,451)	(9,929)	(11,045)	(11,135)	(10,995)	(14,227)
SFR HELOCs and junior liens \| Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total	429,632		431,772
Allowance for credit losses on loans	(12,872)	(12,297)	(13,264)	(12,021)	(11,650)	(10,411)
Other \| Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total	32,529		40,669
Allowance for credit losses on loans	$ (1,646)	$ (1,560)	$ (1,974)	$ (2,162)	$ (2,895)	$ (2,825)